Zirconium Oxide

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zirconium oxide

[‚zər′kō·nē·əm ′äk‚sīd]
(inorganic chemistry)
ZrO2 A toxic, heavy white powder that is insoluble in water, soluble in mineral acids; melts at 2700°C; used in ceramic glazes, special glasses, and medicine, and to make piezoelectric crystals. Also known as zirconia; zirconic anhydride; zirconium dioxide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Zirconium Oxide


(also zirconium dioxide or zirconia), ZrO2, a white crystalline compound, with a melting point of 2900°C. Zirconium oxide is insoluble in water, organic solvents, and the solutions of most acids, alkalies, and salts. It is soluble in hydrofluoric acid, concentrated sulfuric acid, and molten glass. It has amphoteric properties. In nature, it exists as the mineral baddeleyite.

Zirconium oxide is produced in industry by roasting zirconium sulfates or zirconium chlorides. Synthetic crystals of zirconium oxide have been produced (called fianites), which are stabilized by calcium oxide, yttrium oxide, and the oxides of other rareearth elements. More than 50 percent of the zirconium oxide obtained is used in the production of zirconium refractories, ceramics, enamels, and glass; zirconium oxide also serves as a starting material for the production of zirconium.


See references under .
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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ZrO2 refers to Zirconium Oxide, Nb2O5 refers to Niobium Oxide, Ta2O5 refers to Tantalum Oxide.